User's Guide Moisture Content Meter Plus Dew Point, Wet Bulb, and Thermocouple Temperature functions SD Card real-time datalogger Model SDL550 %RH Moisture Content Meter SDL550
Introduction Congratulations on your purchase of the Extech SDL550 Moisture Content Meter. This meter displays and stores Moisture Content readings, Air Temperature, Dew Point Temperature, and Wet Bulb Temperature. Logged data readings are stored on an SD card for transfer to a PC. In addition, an RS232 port allows data streaming to a PC. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Moisture Probe Description 1 1. Probe Handle 2. Probe connecting cable 3. Probe-to-meter input plug 4. Probe collar (probe sensor unscrews from here to access filter) 5. Moisture Sensor penetrating tip 6. Sensor port openings 7. Protective cap (slides off of sensor tip) 2 3 4 6 5 7 Basic Operation Power ON-OFF • • Power the meter by pressing and holding the power button for at least 1.5 seconds. Press and hold the power button for at least 1.5 seconds to power OFF the meter.
Selecting Meter Functions The SDL550 can measure Moisture Content (%RH), Dew Point Temperature (°C/°F), Wet Bulb Temperature (°C/°F), and Thermocouple Temperature (°C/°F). Press and hold the FUNCTION button for 1.5 seconds to begin scrolling through the functions. Release the FUNCTION button when the desired function is displayed. Refer to the table below.
Thermocouple Temperature Measurements 1. Note that the temperature range of the meter extends up to 1300oC (2372oF), however thermocouple sensor ranges vary greatly; be sure to select a thermocouple rated for the expected temperature measurement ranges. 2. Connect a Thermocouple Temperature sensor (not supplied) to the jack at the top of the meter on the left 3. Switch the meter ON by pressing and holding the power button for 1.5 seconds 4.
Setup Mode Basic settings at a glance To view the current configuration of the meter with regard to time, date, and datalogging sampling rate press the SET button momentarily. The meter will now display the configuration in quick succession. If the information is missed on the first try, simply press the SET button again until all of the information is noted. Accessing the Setup mode 1. Press and hold the SET button for at least 1.5 seconds to access the Setup menu. 2.
Setting the Datalogger Sampling Time (Rate) 1. Access the SP-t parameter. 2. Use the arrow buttons to select the desired sampling rate. The available settings are: 0, 1, 2, 5, 10, 30, 60, 120, 300, 600, 1800, and 3600 seconds. 3. Press the ENTER button to confirm the entry. 4. Press and hold the SET button for at least 1.5 seconds to exit to the normal operation mode. Enabling/Disabling the Auto Power OFF Feature 1. 2. 3. 4. Access the PoFF parameter. Use the arrow buttons to select ON or OFF.
Set the Thermocouple Type 1. 2. 3. 4. Access the tYPE parameter. Use the arrow buttons to select the desired sensor type (J or K) Press ENTER to confirm setting. Press and hold the SET button for at least 1.5 seconds to exit to the normal operation mode (or simply wait 7 seconds for the meter to automatically switch to the normal operating mode). Datalogging Types of Data Recording • • Manual Datalogging: Manually log up to 99 readings onto an SD card via push-button press.
Automatic Datalogging In automatic datalogging mode the meter takes and stores a reading at a user-specified sampling rate onto an SD memory card. The meter defaults to a sampling rate of two seconds. To change the sampling rate, refer to the Setup Mode section (the sampling rate cannot be ‘0’ for automatic datalogging): 1. Select the sampling rate in the Setup Mode to a value other than zero. 2. Press and hold the LOG button for at least 1.5 seconds.
RS-232/USB PC Interface The optional 407001A software kit (software and cable) allows streaming of data to a PC via the RS232 Output jack. AC Power Adaptor This meter is normally powered by six (6) 1.5V ‘AA’ batteries. An optional 9V power adaptor is available. When the adaptor is used, the meter is permanently powered and the power button will be disabled. System Reset If the meter’s keys become inoperable or if the display freezes the Reset button can be used to reset the instrument. 1.
Specifications General Specifications Display Backlit LCD; LCD size: 52 x 38mm (2 x 1.
Dew Point Temperature °C °F Range -25.3 to 48.9°C Resolution 0.1°C Range -13.5 to 120.1°F Resolution 0.1°F Note: The Dew Point display value is calculated from the humidity and temperature measurements made by the moisture probe Wet Bulb Temperature °C Range °F -21.6 to 50.0°C Resolution 0.1°C Range -6.9 to 122.0°F Resolution 0.
